EP0837706A1 - Pompe de perfusion de liquides medicaux - Google Patents
Pompe de perfusion de liquides medicauxInfo
- Publication number
- EP0837706A1 EP0837706A1 EP95925033A EP95925033A EP0837706A1 EP 0837706 A1 EP0837706 A1 EP 0837706A1 EP 95925033 A EP95925033 A EP 95925033A EP 95925033 A EP95925033 A EP 95925033A EP 0837706 A1 EP0837706 A1 EP 0837706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- membrane
- cylinder
- disc
- pump according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/14212—Pumping with an aspiration and an expulsion action
- A61M5/14216—Reciprocating piston type
Definitions
- the present invention relates to a medical liquid infusion pump.
- Intravenous infusion is today an essential technique of medication in the case of serious pathologies, such as cancer for example.
- the effectiveness of the treatments is directly linked to the prescribed doses, and limited by the level of toxicity of the active ingredients.
- the precision of the injection is therefore an important criterion in the choice of the material used.
- the injection of an active principle should, in order to respect the patient's biological rhythms, be carried out preferably at certain times of the day, the injection rate possibly being variable throughout the injection period to take into account the immediate effects of the active ingredient on the body.
- Document FR-A-2 689 014 in the name of the Applicant describes a medical liquid infusion pump, with several channels, that is to say capable of allowing the simultaneous infusion of several medical liquids, with the possibility of mixing or no of these liquids inside the pump, which is of a very small footprint, and of a reduced weight, while allowing a very high precision of the flow over a very wide range of flow rates which can vary for example between 1 milliliter per day and 300 milliliters per hour, and which offers significant safety for the patient.
- the pump described in this document of the type comprising at least one suction device with cylinder and piston, of a liquid in a container and of delivery of this one in a tube connected to the patient, is characterized in that it includes:
- a first part in which is provided at least one metering cylinder which, containing a piston driven by a native alter ⁇ ing movement, opens into one of the faces of the part, perpendicular to this face,
- a second part which, bearing on the face of the first part into which each cylinder opens, comprises opposite each cylinder, a cavity of diameter greater than that of the corresponding cylinder, and communicating with a liquid supply container,
- this membrane comprising at least one opening for the liquid passage and allowing the supply of liquid to the cylinder during the displacement of the piston in a direction of increase in the volume of the cylinder, while it ensures the isolation of the cylinder from the supply during the displacement of the piston in in the opposite direction, the liquid then being evacuated from the cylinder by at least one lumen formed therein near the membrane.
- the metering chamber is delimited by a deformable membrane, sandwiched between two parts of the piston, one located inside the metering chamber, and the other located outside the metering chamber. dosage.
- the two parts of the piston are assembled, for example by screwing using a screw passing through an orifice formed in the membrane.
- This solution has the disadvantage that a perfect seal is not produced between the liquid circuit and the outside.
- the piston must be coupled to the drive device so that it can be pulled and pushed. Insofar as it is desired to dismantle the engine by separating the engine part and programming the metering part, which is a wear part, it is necessary to use complex means, in particular by magnetic coupling using a pad. ferromagnetic formed in the piston.
- this solution has the disadvantage of a relatively random attachment of the piston vis-à-vis the engine.
- the object of the invention is to provide a pump of the last type mentioned, in which the seal between the liquid and the outside is carried out in a rigorous manner, and in which the coupling between the motor part and the piston is carried out simple and completely safe way.
- the piston is covered on its end face and on its side wall by an elastic membrane, mounted in tension on the piston, and fixed by its peripheral edge.
- the means for driving the piston being constituted by a device exerting only a pushing force on the piston in the direction of penetration of the piston into the cylinder, the thickness of the membrane is greater than the level from the end face of the piston to that at the side wall of the latter, and the zone of greater thickness of the membrane has, on its face facing outwards, a recess of shape concave, substantially complementary to the convex shape of the membrane delimiting the cylinder.
- the elastic membrane covering the piston ensures a perfect seal of the liquid vis-à-vis the outside by perfectly isolating the metering chamber.
- the elastic return force of the membrane is exerted on the piston and thus ensures the return movement of the latter when no action is exerted on it. It therefore suffices to have drive means which exert a thrust on the piston in the direction of penetration into the cylinder, the piston tending, under the effect of expansion of the membrane, to retreat as soon as it is not further inward of the cylinder. It is therefore not necessary to provide positive drive means between the engine means and the piston, a simple contact being sufficient.
- This shape of the membrane makes it possible to avoid the provision of a dead volume between the latter and the upper membrane, in the advanced position of the piston, which facilitates priming of the pump.
- the elastic membrane covering the piston is made of elastomer or latex.
- the membrane has, near its part covering the front face of the piston, a peripheral ring ensuring the tightness with respect to the cylinder. This arrangement allows the volume of residual liquid between the chamber and the membrane to be kept constant, whatever the operating pressures.
- the drive device of each piston comprises a disc of axis orthogonal to the axis of the cylinder, the edge of which bears on the free end of the piston, and which is rotated around an axis parallel and offset from its own axis.
- the disc whose edge bears against the free end of the piston is fixed on a disc, one face of which has a notch cooperating with a pinion wedged on the output shaft of a geared motor, the two discs being fixed one on the other with offset from their respective axes.
- the disc bearing on the free end of the piston has a center, the position of which will vary with respect to the center of the motorized disc, by rotation around the center of the disc. motorized. It follows that the driven disc will be able to successively exert a thrust on the piston, then release this thrust to allow the piston to go back under the effect of expansion of the membrane.
- a freewheel mechanism preventing movement of the disc in the direction opposite to the direction of drive by the motor, under the effect of the tensile force of the membrane, when the system is stopped or not powered.
- the motorized disc includes peripheral lights intended to be detected by an optical encoder to determine the volume of liquid transferred, this encoder being connected to a pulse counter itself connected to a comparator, comparing the measured pulses to a set value, to control the power supply to the motor.
- the peripheral lights of the motorized disc are arranged according to a sinusoidal function to take account of the offset of the axes of the two discs. This relative arrangement of the peripheral lights makes it possible to make a constant volume correspond to the spacing between two lights, although the lights are not all equidistant.
- the edge of the disc bearing against the piston is covered with a ball bearing.
- the pump comprises a housing containing the programming means and the motor associated with each piston, and a removable cassette ensuring the suction and the delivery of the various liquids, each piston and the membrane which covers it are mounted in the cassette .
- control unit and the cassette can then be assembled simply and quickly, for example by snap-fastening.
- FIG. in perspective of a pump intended to convey four distinct liquids
- Figure 2 is a sectional view on an enlarged scale along the line II-II of Figure 1;
- Figure 3 is a partial view, in longitudinal section, along the line III-MI of Figure 1, on an enlarged scale;
- Figure 4 is a detail view of the movement control device.
- the infusion pump shown in Figure 1, is intended to carry four different liquids. It comprises a box 2 containing means for programming the flow of each of the four liquids and for controlling the pistons of the metering devices. This box also contains electric batteries for powering the motors ensuring the displacement of the pistons.
- a cassette 3 which corresponds to the part ensuring the aspiration of each liquid inside a container constituted for example by a plastic bag, a bottle comprising a socket. air or a syringe, and the discharge of this liquid in a tube connected by a catheter to the patient's body.
- the liquid admissions inside the cassette have the references E1, E2, E3 and E4, while two outlets shown have the references S1 and S2.
- the cassette 3 is fixed to the housing 2 by snap-fastening, using two elements 4 extending the large faces of the housing 2, which have shoulders 5 intended to come to bear on the upper face of the cassette.
- This cassette comprises four metering cylinders 6, in each of which is engaged a piston 7 capable of reciprocating movement.
- the end of the chamber 6 opposite to that by which the piston is actuated is closed by a membrane 8 comprising a central orifice 9 and against which is pressed a disc 10 subjected to the action of a spring 1 2, housed in a chamber 13 located in the extension of the cylinder 6.
- the disc 10 has axial holes 14 to allow the passage of liquid from the inlet orifice E1 in the direction of the membrane 8.
- a light 1 5 for discharging the liquid communicating with an outlet S1.
- the piston is covered on its end face and on its side wall by an elastic membrane 16 mounted in tension on the piston and fixed by its peripheral edge on a fixed support independent of the piston.
- the membrane 16 mounted in tension on the piston and fixed by its peripheral edge on a fixed support independent of the piston.
- the membrane 16 has, near its part covering the front face of the piston, a peripheral ring 21 ensuring the sealing vis-à-vis the cylinder in which the piston is mounted.
- the membrane 1 6 comprises, at the end face of the piston 7, an extra thickness 22 in which is formed a recess 23 of concave shape, substantially complementary to the convex shape of the membrane 8 delimiting the cylinder of dosage.
- the elastic membrane 1 6 is made of elastomer or latex.
- the drive device of each piston comprises an electric motor 24, the output shaft of which is fitted with a bevel gear 25 meshing with the teeth 26 of a disc 27 whose axis 28 is orthogonal to the axis of the piston.
- a disc 27 On this disc 27 is wedged a disc 29, the axis 30 of which is parallel to the axis 28 of the disc 27 but offset with respect to this axis.
- a freewheel mechanism 31 On the axis of the motorized disc 27, a freewheel mechanism 31 is mounted preventing any rotation of this disc in a direction opposite to that provided by the motor 24.
- the disc 27 also has peripheral lights 32 distributed over its periphery, which are identified as the disc rotates by an encoder 33.
- the eccentric disc 29 is equipped on its periphery with a ball bearing 34 whose cage 31 bears on the lower end of the piston 7. During the rotation of the disc 27, the eccentricity of the disc 29 successively results in a thrust of the piston 8, then a suppression of this thrust, situation in which the piston tends to increase the volume of the metering cylinder 6, taking into account the elastic return exerted by the membrane 1 6.
- the slots 32 are arranged according to a sinusoidal function so that the space between two slots always corresponds to the same volume despite the eccentricity of the piston control disc 29.
- FIG. 4 represents the control of the motor 24 from the encoder 33.
- the encoder 33 is connected via a box 35 to a pulse counter
- This pulse counter provides information to a comparator
- This comparator acts on a power supply block 40 of the motor 24.
- each membrane 1 6 disposed in each metering cylinder.
- the motor function of each membrane 1 6, which ensures the return of the piston when no action is exerted on it allows the implementation of a simple drive device, which simply consists in pushing the piston , without requiring a positive coupling between the drive means and the piston.
- the invention is not limited to the sole embodiment of this device, described above by way of example, on the contrary it embraces all variants.
- the device for supplying liquid to each cylinder, and the elements associated with the membrane closing the latter could be different, without thereby departing from the scope of the invention.
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Reciprocating Pumps (AREA)
- External Artificial Organs (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT95925033T PT837706E (pt) | 1995-07-10 | 1995-07-10 | Bomba de perfusao de liquidos medicinais |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR1995/000922 WO1997002852A1 (fr) | 1995-07-10 | 1995-07-10 | Pompe de perfusion de liquides medicaux |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0837706A1 true EP0837706A1 (fr) | 1998-04-29 |
EP0837706B1 EP0837706B1 (fr) | 2000-03-08 |
Family
ID=9475544
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95925033A Expired - Lifetime EP0837706B1 (fr) | 1995-07-10 | 1995-07-10 | Pompe de perfusion de liquides medicaux |
Country Status (10)
Country | Link |
---|---|
US (1) | US6095757A (fr) |
EP (1) | EP0837706B1 (fr) |
JP (1) | JPH11508795A (fr) |
AT (1) | ATE190228T1 (fr) |
AU (1) | AU712845B2 (fr) |
DE (1) | DE69515528T2 (fr) |
DK (1) | DK0837706T3 (fr) |
ES (1) | ES2143638T3 (fr) |
GR (1) | GR3033093T3 (fr) |
WO (1) | WO1997002852A1 (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10035834A1 (de) * | 2000-07-21 | 2002-02-07 | Grundfos As | Dosierpumpe mit einem Elektromotor |
DE10120543A1 (de) * | 2001-04-26 | 2002-11-07 | Ruediger Groening | Arzneimittelpumpe mit programmierter Abgaberate |
US8047405B2 (en) * | 2006-03-20 | 2011-11-01 | Hewlett-Packard Development Company, L. P. | Volumetric is fluid dispensing devices, systems, and methods |
US7951112B2 (en) * | 2007-05-16 | 2011-05-31 | Smiths Medical Asd, Inc. | Pump module for use in a medical fluid dispensing system |
US8876765B2 (en) * | 2007-05-16 | 2014-11-04 | Smiths Medical Asd, Inc. | Pump module for use in a medical fluid dispensing system |
US20090246035A1 (en) * | 2008-03-28 | 2009-10-01 | Smiths Medical Asd, Inc. | Pump Module Fluidically Isolated Displacement Device |
US8105269B2 (en) | 2008-10-24 | 2012-01-31 | Baxter International Inc. | In situ tubing measurements for infusion pumps |
US8137083B2 (en) | 2009-03-11 | 2012-03-20 | Baxter International Inc. | Infusion pump actuators, system and method for controlling medical fluid flowrate |
US8382447B2 (en) | 2009-12-31 | 2013-02-26 | Baxter International, Inc. | Shuttle pump with controlled geometry |
US8567235B2 (en) | 2010-06-29 | 2013-10-29 | Baxter International Inc. | Tube measurement technique using linear actuator and pressure sensor |
WO2015063562A1 (fr) * | 2013-10-30 | 2015-05-07 | Swissinnov Product Sarl | Propulseur de fluide |
CN111928110A (zh) * | 2020-07-21 | 2020-11-13 | 温州宝德电气有限公司 | 一种充气设备 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3976402A (en) * | 1974-07-15 | 1976-08-24 | Origo, Inc. | Intravenous delivery pump |
US3993061A (en) * | 1975-02-28 | 1976-11-23 | Ivac Corporation | Syringe pump drive system and disposable syringe cartridge |
US4519792A (en) * | 1982-12-06 | 1985-05-28 | Abbott Laboratories | Infusion pump system |
US4798589A (en) * | 1987-06-15 | 1989-01-17 | Fisher Scientific Group Inc. | Diaphragm pump cassette |
US4919596A (en) * | 1987-12-04 | 1990-04-24 | Pacesetter Infusion, Ltd. | Fluid delivery control and monitoring apparatus for a medication infusion system |
US5097122A (en) * | 1990-04-16 | 1992-03-17 | Pacesetter Infusion, Ltd. | Medication infusion system having optical motion sensor to detect drive mechanism malfunction |
FR2689014B1 (fr) * | 1992-03-24 | 1994-06-03 | Aguettant Lab | Pompe de perfusion de liquides medicaux. |
FR2715310B1 (fr) * | 1994-01-24 | 1996-03-01 | Aguettant Cie Dev | Pompe de perfusion de liquides médicaux. |
-
1995
- 1995-07-10 JP JP9505537A patent/JPH11508795A/ja not_active Ceased
- 1995-07-10 ES ES95925033T patent/ES2143638T3/es not_active Expired - Lifetime
- 1995-07-10 DK DK95925033T patent/DK0837706T3/da active
- 1995-07-10 US US08/983,240 patent/US6095757A/en not_active Expired - Fee Related
- 1995-07-10 EP EP95925033A patent/EP0837706B1/fr not_active Expired - Lifetime
- 1995-07-10 AU AU29313/95A patent/AU712845B2/en not_active Ceased
- 1995-07-10 WO PCT/FR1995/000922 patent/WO1997002852A1/fr active IP Right Grant
- 1995-07-10 DE DE69515528T patent/DE69515528T2/de not_active Expired - Fee Related
- 1995-07-10 AT AT95925033T patent/ATE190228T1/de not_active IP Right Cessation
-
2000
- 2000-03-29 GR GR20000400782T patent/GR3033093T3/el not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9702852A1 * |
Also Published As
Publication number | Publication date |
---|---|
DK0837706T3 (da) | 2000-07-24 |
ATE190228T1 (de) | 2000-03-15 |
EP0837706B1 (fr) | 2000-03-08 |
AU2931395A (en) | 1997-02-10 |
US6095757A (en) | 2000-08-01 |
AU712845B2 (en) | 1999-11-18 |
JPH11508795A (ja) | 1999-08-03 |
WO1997002852A1 (fr) | 1997-01-30 |
GR3033093T3 (en) | 2000-08-31 |
DE69515528D1 (de) | 2000-04-13 |
ES2143638T3 (es) | 2000-05-16 |
DE69515528T2 (de) | 2000-11-23 |
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